Asked point blank on Wednesday during an interview with Univision, Romney described his net worth in very general terms.

"I actually disclosed in a financial disclosure statement all of the assets which I own, and I think the estimate in there was a pretty wide range, it's been widely reported and my net worth is within that number," he said. "It's between $150 and about $200-and-some-odd million dollars, I think that's what the estimates are."

Not quite.

Romney's assets total between $85 and $264 million, according to his official disclosure document filed with the Federal Election Commission.

The range is so wide because, while required to report all assets, candidates characterize those investments and holdings in very broad terms. For example, Romney has a few assets valued between $5 and $25 million.

In light of that, the Romney campaign has offered what it billed as a "more accurate" estimate: $190 to $250 million. While there is some overlap, that's much more than Romney himself suggested Wednesday.

So he's rich. We're just not sure exactly how rich.

The range narrows if you accept the bottom line estimate from the campaign, $190 million, and take Romney's word that it tops out around "$200-and-some-odd million."

The media isn't any better at pinning down a number. In 2008, the Wall Street Journal estimated Romney's net worth at between $250 and $500 million. In 2007, the New York Times took a stab based on estimates from compensation experts. Their guess: more than $500 million. The same year, Money Magazine said $202 million.

The Romney campaign released more than 500 pages of tax documents on Tuesday, including estimates for 2011. The returns were prepared by accounting giant PricewaterhouseCoopers.

A flip through those returns reveals why it might actually be pretty difficult for Romney to accurately estimate his net worth at any given moment.